Photometric study of the young open clusters IC 1442, King 21, and Trumpler 7
arXiv:2005.07375 · doi:10.1093/mnras/staa1370
Abstract
We carried out UBVRcIc photometric study of three poorly studied young open clusters IC 1442, King 21, and Trumpler 7 (Tr 7). We obtained 263, 244, and 128 member stars using Gaia DR2 proper motions and parallaxes in IC 1442, King 21, and Tr 7, respectively. The reddening, E(B-V), was derived to be 0.54+/-0.04, 0.76+/-0.06, and 0.38+/-0.04 mag for these clusters. The comparison of observed colour-magnitude diagrams (CMDs) with solar metallicity isochrones yields log(Age) = 7.40+/-0.30, 7.70+/-0.20, and 7.85+/-0.25 yr and corresponding distances 2847+/-238, 2622+/-156, and 1561+/-74 pc for IC 1442, King 21, and Tr 7, respectively. The estimated mass function (MF) slopes are found to be -1.94+/-0.18, -1.54+/-0.32, and -2.31+/-0.29 for IC 1442, King 21, and Tr 7, respectively. The study of MF slopes determined separately in the inner and the outer regions of these clusters gives a steeper slope in outer region which suggests spatial variation in slope and mass segregation in the clusters. We found evidence of mass segregation after dynamical study in these clusters. The obtained relaxation time is 74, 26, and 34 Myr for the clusters IC 1442, King 21, and Tr 7, respectively. The mass segregation in IC 1442 may be caused by early dynamical relaxation. The estimated relaxation time is well below to the ages of King 21 and Tr 7 which indicates that these clusters are dynamically relaxed.
This article is accepted for publication in MNRAS
References in corpus (29)
- Clusters and mirages: cataloguing stellar aggregates in the Milky Way
- Dynamical mass segregation on a very short timescale
- Using the minimum spanning tree to trace mass segregation
- A catalog of newly identified star clusters in GAIA DR2
- Hunting for open clusters in \textit{Gaia} DR2: new OCs in the Galactic disc
- Hunting for open clusters in \textit{Gaia} DR2: the Galactic anticentre
- Extended stellar systems in the solar neighborhood - I. The tidal tails of the Hyades
- The Origin of the Arches Stellar Cluster Mass Function
- Structure and mass segregation in Galactic stellar clusters
- The spiral pattern rotation speed of the Galaxy and the corotation radius with GAIA DR2
- Be phenomenon in open clusters: Results from a survey of emission-line stars in young open clusters
- Recent advances in the determination of some Galactic constants in the Milky Way
- Mass functions and photometric binaries in nine open clusters
- Median Statistics Estimate of the Distance to the Galactic Center
- Do star clusters form in a completely mass-segregated way?
- The Gaia-ESO Survey: age spread in the star forming region NGC6530 from the HR diagram and gravity indicators
- Reddening, Distance, and Stellar Content of the Young Open Cluster Westerlund 2
- Photometric, kinematic and variability study in the young open cluster NGC 1960
- The old open cluster NGC 2112: updated estimates of fundamental parameters based on a membership analysis
- Photometric and Kinematic study of the three intermediate age open clusters NGC 381, NGC 2360, and Berkeley 68
- Characterizing low contrast Galactic open clusters with GAIA DR2
- Open clusters and associations in the Gaia era
- CCD photometric search for peculiar stars in open clusters. VIII. King 21, NGC 3293, NGC 5999, NGC 6802, NGC 6830, Ruprecht 44, Ruprecht 115, and Ruprecht 120
- A study of the blue straggler population of the old open cluster Collinder 261
- Characterizing dynamical stages of open clusters located in the Sagittarius spiral arm
- The extended Main-Sequence Turnoff of the Milky Way open cluster Collinder 347
- Young open cluster IC 4996 and its vicinity: multicolor photometry and Gaia DR2 astrometry
- The Usefulness of 2MASS JHKs Photometry for Open Cluster Studies
- Variable Stars in Young Open Cluster NGC 2244